Exploring Gravity with Proof-Mass Technologies Ho Jung Paik University of Maryla

Exploring Gravity with Proof-Mass Technologies Ho Jung Paik University of Maryla www.phwiki.com

Exploring Gravity with Proof-Mass Technologies Ho Jung Paik University of Maryla

Vilaboy, Martin, Executive Editor has reference to this Academic Journal, PHwiki organized this Journal Exploring Gravity with Proof-Mass Technologies Ho Jung Paik University of Maryl in addition to July 6-10, 2008, Warrenton, VA Inertial Technology Gravity experiments in addition to experiments searching as long as gravity-like as long as ces invariably employ test masses. To overcome the vibrations of the plat as long as m, these experiments often make a differential measurement over two or more test masses. The test mass response is monitored by using an electric field (Microscope, LISA), magnetic field (GP-B, STEP, SMART), or light (LISA). Advantages of Space Zero-g frees test masses completely from the housing (f0 < 103 Hz) in addition to eliminates many g-induced errors. GP-B, STEP, SMART, LISA Extremely quiet dynamic environment free from the seismic in addition to gravity noise of the Earth. GP-B, STEP, SMART, LISA Bigger gravity signal achieved by rotating the spacecraft with respect to the Earth. STEP, SMART Much longer baseline achievable in space. LISA Volyn National University Lesja Ukrainka UA www.phwiki.com

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GP-B To search as long as dragging of the local inertial frame by a rotating mass, 41 milliarcsec per year. A spinning superconductor generates a magnetic moment, called “London moment.” As the gyro precesses, the magnetic flux through the superconducting loop varies in addition to generates a signal, which is detected by the SQUID. The spacecraft is rolled to modulate the signal at 1.6 mHz. STEP To test EP to 1018 at 104 km. To eliminate gravity gradient coupling to Earth, a nested cylinder geometry is used as long as test masses. The differential acceleration is detected magnetically by using thin-film superconducting coils coupled to a SQUID. Microscope To test EP to 1015 at 104 km by using capacitive accelerometers. SMART Same scientific goal as STEP. Outer test masses are spherical. Suspension in addition to alignment by a current along a single tube CMRR 108 Drag-free system may not be needed SMART uses wire-wound coils.

LISA To detect GW at 104-101 Hz. Laser interferometry between three spacecrafts separated by 5 106 km. Test mass position with respect to the spacecraft is measured by an LC capacitor bridge. Error Sources Brownian motion of the test masses Cryogenic, low loss Amplifier noise Soft suspension, SQUID, laser interferometer Plat as long as m vibrations Differential measurement, drag-free system Gravity noise Liquid helium control, no moving parts Parasitic as long as ces Electrostatic (trapped charge, patch fields), magnetic Metrology errors Precision machining

Vilaboy, Martin IP Business Executive Editor www.phwiki.com

Vilaboy, Martin Executive Editor

Vilaboy, Martin is from United States and they belong to IP Business and they are from  Tempe, United States got related to this Particular Journal. and Vilaboy, Martin deal with the subjects like Internet

Journal Ratings by Volyn National University Lesja Ukrainka

This Particular Journal got reviewed and rated by Volyn National University Lesja Ukrainka and short form of this particular Institution is UA and gave this Journal an Excellent Rating.